Here's what the ASPCA recommends about unvaccinated puppies: "It’s essential for young puppies to meet and interact with a variety of different dogs during their socialization period, from about 3 to 16 weeks of age. (For more information, please see our article, Socializing Your Puppy.) However, before they’ve been fully vaccinated, puppies are extremely vulnerable to potentially deadly contagious diseases, such as parvovirus.Because so many dogs frequent a dog park, the chances of exposure to dangerous pathogens are higher there. Until your puppy has had all her shots, don’t take her to the dog park. Instead, you can arrange play dates at the homes of friends and family who have healthy dogs and puppies. You can also enroll your puppy in a puppy class that includes off-leash playtime in a safe, hygienic area."